Sanding device



E. TAMBlNI SANDING DEVICE July 6, 1948.

, Filed March 21, 1946 Patented July 6, 1948 UN ITED STATES" OFFICE 1 fSANDING DEVICE i Eugene .Tambini, Milford, Conn.

Application March 2.1, 1946, Serialk No. 655,958

rI-his invention relates vice-'adapted for polishing, buing, sanding,

vscraping and the like.

It is-an object of this invention to provide a lnew surfacing device`vide'a small, portabla'hand controlled and power operated surfacingdevice for rapid and convenfient s-urface finishing processes.

-Additional'objects of this invention as well as its construction, useand operation will in part be `r`olflvious'and-will in part becomeapparent fro the following disclosure. 'For' further comprehension ofthe invention, and of the-objects and advantages thereof; reference willbe had to the following description and accompanying drawings, and tothe appendked claim' in which the various novel featuresy of theinvention are more particularly set forth.

-ln vthe accompanying drawing forming a ma- "terial part of thisdisclosure:

Fig. 1 is a perspective view of a surfacing device according to one formof this invention.

Fig 2 is a side cross section of the head of the article shown in Fig. ltaken along line 2 2. Fig. 3 is a' front cross section of the articleshown in Fig. 2 taken along the line 3 3.

Fig. 4 is an enlarged fragmentary side cross section of a valvearrangement shown in Fig. 2.

Fig. 5 is a fragmentary exploded perspective view of a mounting meansaccording to one form Vof this invention for portably mounting the headof the device to the body and driving means.

Fig. 6 is an enlarged exploded perspective view of another means formounting the head and the body and driving means.

' `Referring to the figures in detail, there is shown in' Fig. 1 avportable surfacing device generally designated I0, comprising a body orhousing Il, having a handle I2, and having a head I3 opverablypositioned at one end thereto, as will be hereinafter described. Withinhousing I I there is a power driving meanssuch as, a conventionalelectrical motor (not sh'own'in the figures) which isi adapted to rotatea shaft I4 extending from the front of the housing the motor beingoperably connected to this shaft by conventional means such as a seriesof gears which likewise are not shown in the figures. The power is supingeneral to a surfaci-ng device and in particular to a surfacing de- 1Claim. (Cl. 51-196) `plied tothe motor through an electric"co1d..-.|=5

or the like. f

` In Fig. 2 there is shown afconstruction andarrangement of the head I3referred to inconnection with Fig. 1. This head I3 comprises. a :hollowshaft |6 adapted-to be mounted @n.shaft III as will be describedhereinafter. `The front-portion of shaft I6 is threaded `to receiveotherparts rcomprising ahead assembly, and at the front end of shaft I6is mounted a disc |`I which acts Aas a stop to hold together the headassembly.

Disc has a hole through its center aligned with -thehollow in shaft I 6so that a direct air passage is provided running through shaft Il anddisc 1I'I.

At the front end of shaft. I tand bearing. against disc I1 is a flexiblewasher |8,-and` `adjacent thereto and bearing against washer I8 is avgenerally circular clamping plate I9 which has a projecting portion 29mountedon its rear face. Positioned behind plate I9 is a secondgenerally circular clamping plate 2| having in its front surfacea'recess 22 to receive projection 20. vBehind plate 2| is a nut 23,operably engaging the threaded portion of shaft I6, and adapted` to bearagainst plate 2| thereby tightening 'the entire assembly disc |`I,washer I8 and plates I9 and 2|.

A flexiblebag 24 is adapted to be positioned on the above described headassembly and comprises a thin flexible sheet material in bag-like formhaving an'open end 25 which is adapted to be placed between and receivedbetween plates I9 and 2l. When bag 24 is so mounted, it will be seenthat there is an air space or chamber 26 contained within the bag infront of the pre` viously described head assembly. By the coaction ofbag- 24, disc I7, washer I8 and plate I9,

`the chamber 26 is thoroughly sealed except for the hollow leadingthrough disc Il and shaft I6.

transformed into one of a `number of surfacing devicesby placinglasheet28 of a surfacing material around bag 24 and securing the ends of thesurfacing sheet 28 between plates I9 and 2|. In this Way, byinterchanging sheet 28 among such sheet material as, for example, sandpaper,

3 paper, emery cloth polishing cloth and the like, a number of differentsurfacing heads may be produced from the same general head assembly I3,whereby the device is interchangeably adapted for numerous purposes.

In Fig. 4 there is shown one of numerous simple valve arrangements 2I,whereby compressed air or the like may be releasably introduced intochamber 26 through shaft I6. This valve arrangement 2'Icomprises aplunger pin 38 having a head 3| at its forward end, and being mounted bymeans of -spring 32 between the pair of shoulders 33 and 34 mountedwithin and adjacent to the end of shaft I6. Spring 32 optionally ismounted on plunger pin 38 by means of a pair of discs 35 which are notairtight, and accordingly permit the passage of air therearound. n

When pin 38 is depressed, head 3I` is forced'away from shoulder 33whereby air or other fluid mayv be forced through shaft I8. When pin 30is released, spring 32 operates to force head 3l against shoulder 33whereby the passage through shaft I6 is closed. It is noted that thepressure of a fluid within chamber 26 will normally tend to close thisValve assembly.

In Fig. there is shown one mounting arrangement generally designated 3'Icomprising a small projecting pin 38 on the end of shaft IE adapted toreleasably engage a slot 39 in shaft I4 when shaft I=B is inserted intothe open hollow end of shaft I4. Preferably, the end 4I of slot 39 isbent at right angles to the direction of shafts I4 and I6 whereby pin 38will be locked in position therein. Also and optionally, a shoulder 48near the end of shaft I6 is adapted to bear against the end of shaft I4when it is properly inserted therein.

According to the arrangement shown in Fig. 5 it will be understood thatthe end 4I ofslot 39 will be so directed that the reaction of the.y

power operation of the device will tend to tighten pin 38 in slot 39rather than to loosen it. .Whereby the operation of the device tends tosecure head I3 in shaft I4 rather than to loosen it.

In Fig. 6 there is shown another mounting means between shaft IG andshaft I4 wherein there is provided a positive locating means. In thisform of the invention, the end of shaft I4 is hollow in an angularstructure, for example, a hexagonal formation 42. Adjacent this bent endof shaft I4 is a threaded portion 43. The end of shaft I8 has an angularprojection 44, such as a hexagonal projection adapted to engage hollow42 in shaft I4. A collar or shoulder 45 adjacent this projection bearsagainst the end of shaft I4, and an internally threaded nut 4,6positioned around shaft I6 is adapted to engage the threaded portion 43of shaft I4 and to bear against collar 45, thereby securely clampingtogether shaft I6 and shaft I4. The angular formation of projection 44and hollow 42 insures a positive driving means vbetwern the shafts andthe threaded connection between nut 46 and threaded portion 43 insures asecure interconnection between the shafts.

In the use of this invention, the suitable head assembly, such as a headI3, shown in Fig. 2 and equipped with a sheet 28 of sand paper, isinflated by means of compressed air passed through shaft IS or the like.This assembly is then connected to shaft I4, as shown in Figs. 5 or 6,

4 and the power is connected whereby head I3 is rapidly rotated.

The device is then used for a sanding operation by the simple process ofholding the device by handle I2 and directing head I3 against thesurface t0 be sanded.

It will be understood that there may be used various heads havingdiierent grades of finishing material or, if desired, finishingmaterials of entirely different type sothat the device may be used fornumerous finishing operations in rapid I with another head.

The device is useful for numerous operations such as, waxing, polishing,bufng, sanding, paint removing and the like on met-al or woodconstruction surfaces, various household surfaces, automobiles, boatsand other articles of numerous description.

While I have illustrated and described the preferred embodiments of myinvention, itis to be understood that I do not limit myself to theprecise constructions herein disclosed and the right is reserved to allchanges and modifications coming within the scope '0f the invention asdened in the appended claim.

Having thus described my invention, what I claim as new, and desire tosecure by United States Letters Patent is:

In combination with a portable power-driven shaft and coupling elementon its outer end, of a builing head detachagly coupled with said shaft,said bu'ng head comprising an axially hollow shaft having screw threadsadjacent one end thereof, a coupling member and a valve adjacent theother end thereof, said valve being disposed inside said hollow shaftfor closing the shaft with respect to air passing Ioutwardly thereof, adisc mounted on said threaded end of said shaft supporting a clampingplate, a flexible pneumatic bag supported upon said plate, an abrasivemember supported upon said bag, a second clamping plate, the edges ofthe bagand abrasive member being positioned between said clamping platesand retained in position therebetween, a clamping nut on said threadedportion of the shaft for pressing the clamping plates together tosealingly hold said bag and abrasive member upon the end of saidsli-aft, whereby said buihng head may be inflated to a predeterminedpressure before being coupled to the powerdriven shaft, said Valvemaintaining said pressure during normal use of said buffiing head.

EUGENE TAMBINI.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 849,338 Rogers Apr. 2, 19071,138,926 Bernett May 11, 1915 1,279,996 Dorland Sept 24, 1918 1,479,583Carey Jan. 1, 1924 1,656,182 Enna 1 Jan. 17, 1928 1,966,521 Ricks July17, 1934 FOREIGN PATENTS Number Country Date 23,394 Great Britain 1904

